Scratch-gage



(No Model.)

J. E. SHERMAN.-

SGRATOH GAGE.

No. 290,807. Patented De c. 2 5, 1883.

INVEN TOR:

ATTORNEYS.

WITNESSES W fijwk JNITED STATES PAT NT Orricnl,

JOHN SHERMAN,-OF NORTH ATTLEBOROUGH, MASSACHUSETTS.

SCRATCH-GAG E.

SPECIFICATION forming part of Letters Patent No. 290,807, dated December25, 1883. Application filed November 14,1883. (X model.)

To aZZ whom it may concern.

Be it known that 1, JOHN E. SHERMAN, of North Attleborough, in thecounty of Bristol and State of Massachusetts, have invented certain newand useful Improvements in Scratch- Gages, of which the following is afull, clear, and exact description.

My invention relates to gages used by carpenters and others forscratching or scribing work; and it consists in certain novelconstructions and combinations of parts in such devices, including aslide and thumb-piece both arranged upon the rod or stock of the deviceand constructed to engage with each other by. means of a split screw andtaper socket, for locking and releasing the slide upon the rod,

to provide for adjustment of the gage, also including a many-pointedscratcher or marker upon the end of the rod, the whole being preferablyso constructed that it may be used to perform itswork withoutrestriction to any one side of the device being uppermost, whereby thegage maybe much more quickly and easily applied and the durability ofthe many-pointed marker is increased.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 represents a longitudinal view of a scratch-gage embodying myinvention; Fig. 2, a longitudinal section of the same, in part, upon alarger scale; Fig. 3, a face view of an adjustable thumb-piece, formingone of the details, detached; Fig. 4., alongitudinal section of themarking end portion of the rod or stock of the gage, with themany-pointed marker at tached; and Fig. 5, a face view of the same.

A indicates the stock, bar, or rod of the device, preferably of circularform, as are also the other details of the device, and whereby, amongother advantages,the scratch-gage may be used without restriction to anyparticular side being uppermost, which will greatly facilitate the useof the instrument. Upon this stock or bar A is fitted a slide, B,forming the head of the gage, and which, when of circular form, asshown, projects equally from all sides of the rod; also a slidingthumb-piece or clamp, 0, having projecting from its face a screw, 1),

which is constructed with three (more or less) longitudinal slits, 0,extending inward from the outer end of the screw, which outer end is ofround or taper form, as shown in Fig. 2, to bear within or against ataper'socket portion, (I, at the inner end of a female-screwthreadedportion, 0, in the slide B, so that when the thumb-piece C is screwedup, the split hollow screw Z), engaging with the slide 13, will beclosed upon and caused to clamp the rod A, and so hold the slide B atits proper position upon the rod A and at the required distance from themarker D, according to the adjustment of the gage. If preferred, thisconstruction of the thumb-piece O and slide B may be reversed-that is tosay, the split screw may be on the slide and the socket which it fits inthe thumb-piece.

The marker D is a many-pointed circular one, which may be secured to theworking end of the bar A by a screw, f, or otherwise, and which willhave its durability increased by the circular construction of the gage,that causes different scratching-points to bebrought at different timesinto action. Only a slight turn of the thumb-piece is necessary eitherto release or clamp the slide B, which permits of its ready adjustmentalong the bar.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A scratch-gage in which is combined a rod or stock having a marker onits forward end, and a head or slide and thumb-piece, both fitted tomove on and along said rod, and constructed,respective1y,with ahollowsplit screw and tapering screw-threaded socket in the axial line of therod, for release and hold of the slide on the rod, and to provide foradjustment of the gage, substantially as specified.

2. In ascratch-gage, the combination of the circular rod A, having amarker on its forward end, and the slide B and thumb-piece C, insplitscrew and tapering-socket connection with each other in the axialline of the rod, as described, and constructed to move along and turnupon said rod when the split screw is released from grip thereon,essentially as and for the purpose herein set forth.

3. In a scratch-gage, the combination of the many-pointed marker D withthe rod A and piece 0, provided with a hollow split clamp the slide Band thumb-piece O, in split-screw ing-sorew, b, the Whole beingconstructed and I0 and tapering-socket connectionwith each otherarranged for operation substantially as shown in the axial line of therod andfor adjustment and described.

5 on and along the rod, essentially as specified. JOHN E. SHERMAN.

4. The combination of the rod A, the many- Vitnesses: pointed marker D,the slide B, havingascrew- F. B. BYRAM,

threaded tapering socket, d a, and the thumb- E. S. YVILLIAMs.

